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.. - <br /> W. A <br /> �s <br /> saturated zone is found in this layer at a d-pth of approximately <br /> 10.5 feetti <br /> General Hydrogeologic Setting <br /> The site lies approximately 3 miles west of the San Joaquin <br /> River and the canal systems for the Sacramento Valley. The water <br /> supply in the area is provided by the city of Tracey. The Tracey <br /> area is on the west-central flsnk of the Sacramento Valley drainage <br /> basin. The depth to groundwater is approximately 10 feet below <br /> surpears to be to <br /> theface grade. The northeast, based don topograph is and surface irection of roundwater ldrainageow patterns. <br /> SITE HISTORY/BACKGROUND <br /> The current business activity at the site is a video <br /> rental/sales store. It was reported to TECO that the site was <br /> formerly used as a retail gasoline service station. Approximately <br /> 60 feet of underground product lines were connected to the <br /> underground fuel storage tanks and a product dispenser area (pump <br /> island) located on the southeastern portion of the. property. <br /> According to interviews wit" the present tennant, the USTs were <br /> removed some time in 1971. There were no known details of the <br /> tanks removal, contents or disposal, nor were any as-built. plans <br /> available for review by TECC personnel. on JulY 18, 1989, TECC <br /> collected 3 soil samples of the soil/water interface (saturated <br /> ' zone) along the perimeter of the estima.ten former location of the <br /> ort of findings entitled "Limited Subsurface Soil <br /> USTs. The rep <br /> l Investigation ort Gra Road, Tracey-August 21, 1989" is <br /> included in Appendix A of this work plan. The 4 soil samples wEPA <br /> analyzed for Total Petroleum Hydrocarbons(as gasoline)-TPHg- <br /> e, Toluene, Ethylbenzene and Xylenes (BTEX) <br /> Method 8015 and Benzen <br /> EPA Method 8020. Analytical To l results indicated concentrations of <br /> TPHg above the detection levels of 1 ppm in 2 samples near the <br /> les <br /> northeastern and <br /> sampleseyBI-1 and corner <br /> B4-1 the <br /> on the building <br /> chainh <br /> are designatedof custody <br /> attached to the report. <br /> TECC removed"a 250-gallon UST that had last contained waste oil. <br /> This removal was accomplished on December 6,. 1989. The results of <br /> the soil sampling and report of findings .is contained in the March <br /> 15, 1990 TECC Proposal entitled "Proposal for Soil Excavation, Soil <br /> Sampling, Transport/Disposal and Site Restoration-275 Grantline <br /> Road, Tracey, California". Analytical results indicated detectable <br /> amounts of TPHg in 2 of the 3 soil samples collected from the base ,,�,�/�� <br /> of the UST excavation. No detectable amounts of Purgeable Halogen <br /> d above detection limits <br /> compounds (EPA Method 8010) were detecte / <br /> nor were any TPH(as diesel) concentrations observed. Oil and <br /> Grease concentrations of 10, 310 and 20 parts per million (ppm) <br /> were indicated in the analytical results. Further excavation wast <br /> recommended to th3 client and the San Joaquin County Public Health <br /> Services--Environmental Health Dision (SJCPHS-EHD) in the TECC <br /> PAGE 2 OF 5 <br /> H.\APPS\WP51\TOMS\275GRNTLN WORK PLAN <br />